US PATENT SUBCLASS 137 / 527.8
.~.~.~ Weight biased

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
527  DF  .~.~ Pivoted valves {4}
527.8.~.~.~ Weight biased

DEFINITION

Classification: 137/527.8

(under subclass 527) Devices which are provided with means having sufficient mass to maintain the valve in the desired position in response to gravity.